A TIME investigation reveals the Tehran regime's strategy to gain influence in Iraq--and why U.S. troops may now face greater dangers as a result

The U.S. Military's new nemesis in Iraq is named Abu Mustafa al-Sheibani, and he is not a Baathist or a member of al-Qaeda. He is working for Iran. According to a U.S. military-intelligence document obtained by TIME, al-Sheibani heads a network of insurgents created by the Iranian Revolutionary Guard Corps with the express purpose of committing violence against U.S. and coalition forces in Iraq. Over the past eight months, his group has introduced a new breed of roadside bomb more lethal than any seen before; based on a design from the Iranian-backed Lebanese militia Hizballah, the weapon employs "shaped" explosive charges...